咨询 悄悄问道题

[摸鱼奇才咖啡喵]

原题是

When marginal utility is falling but positive, total utility will?

A. Decrease at an increasing rate

B. Decrease at an decreasing rate

C. Remain the same

D. Increasing at an increasing rate

E. Increasing at an decreasing rate

标答给的是E

我不能理解